Posted by
Bruce Sherwood on
URL: http://friam.383.s1.nabble.com/atmospherics-tp7580185p7580187.html
Huh? That makes no sense. Moreover, there is NO hydrogen or helium in
our atmosphere. Any that we might have once had is long gone. Given
the very large average height and correspondingly high average speed
(and much higher speed in the high-speed tail of the distribution),
these very-low-mass species can simply escape from Earth. More
dramatically, the gravitational field of low-mass objects such as
asteroids is too small to keep an atmosphere of any kind.
Bruce
On Wed, Jun 13, 2012 at 6:09 PM, ERIC P. CHARLES <
[hidden email]> wrote:
> As, oddly, no one seems to have mentioned it yet... I'm pretty sure that air
> does separate. Am I wrong to think that "air" at a high enough altitude is
> mostly hydrogen? So the question is not what keeps it from separating, but
> what keeps it from separating more fully... right?
>
> Eric
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